David Passell had ideas to send to me after reading my email to him the other day. I got his email with his comments added in red so they were easy to find.

I hadn’t noticed this feature before, but it’s so easy I will be using it myself.

Open Mac's Mail program.
Highlight the Subject of one of the emails you've received.
On the top menu bar click on Message.
On that drop down menu go to Move to Drafts, but if you want to preserve the inbox message intact choose Copy to Drafts.
Double click on the Message in Drafts and it will come up as a draft to be edited, addressed, etc.

Here’s where you can click on the little black box by the name of the font and the font size and choose another color so your writing stands out from the color that the email came to you. (Click on this screen shot to enlarge it, then click again to come back to this article.)

6. Make any desired changes, address it, and then Send.

David put his comments in red, but you can choose the color. This makes it easy to critique, suggest, or improve what the other person has written.

Practice by sending yourself an email message and trying out the steps above.